In-Browser SQL Query Studio
In-Browser SQL Query Studio (DuckDB-Wasm)
Query massive CSV, Parquet, Excel, and JSON files with full SQL analytics executed 100% inside your browser WebAssembly sandbox.
Drop CSV, Parquet, Excel, or JSON to query with SQL
Fast in-memory analytical SQL powered by DuckDB WebAssembly • Zero server tracking
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About In-Browser SQL Query Studio
Analyzing confidential business datasets, customer dumps, or multi-gigabyte log extracts usually requires spinning up local databases or uploading sensitive files to cloud SaaS platforms. ConvertSheet's In-Browser SQL Studio changes that paradigm by embedding DuckDB WebAssembly directly into your browser. You can drag and drop massive CSV, Parquet, JSON, or Excel files, run complex aggregations, joins, filters, and window functions, and export the resulting datasets to CSV or Excel with complete data privacy.
How to Convert In-Browser SQL Query Studio to Result Online in 3 Simple Steps
Convert your data effortlessly with zero installations and complete local privacy.
- 1Step 1:
Drop or Select Data File
Drop any CSV, Parquet, Excel (.xlsx), or JSON file to register it as an in-memory table named 'data_table'.
- 2Step 2:
Write or Choose SQL Query
Write any standard SQL query or click one of the quick presets (Limit 50, Count Rows, Summarize Stats).
- 3Step 3:
Execute & Export
Press Cmd/Ctrl + Enter to run the query in milliseconds, inspect results, and download as CSV or Excel.
Frequently Asked Questions: In-Browser SQL Query Studio
Answers to common questions regarding inputs, calculations, and mathematical methodology.
Is my data uploaded to any server when running SQL queries?
No. All execution occurs 100% client-side inside a DuckDB WebAssembly virtual machine running directly in your browser's memory. No data is ever sent to any remote server.
What SQL dialect does this studio support?
It supports DuckDB's full PostgreSQL-compatible SQL dialect, including CTEs (WITH clauses), window functions, regular expressions, and nested JSON operators.
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